1572161 has 4 divisors (see below), whose sum is σ = 1579824. Its totient is φ = 1564500.

The previous prime is 1572149. The next prime is 1572163. The reversal of 1572161 is 1612751.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1612751 = 7 ⋅230393.

It is a cyclic number.

It is not a de Polignac number, because 1572161 - 2⁶ = 1572097 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1572163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3515 + ... + 3936.

It is an arithmetic number, because the mean of its divisors is an integer number (394956).

2^1572161 is an apocalyptic number.

It is an amenable number.

1572161 is a deficient number, since it is larger than the sum of its proper divisors (7663).

1572161 is an equidigital number, since it uses as much as digits as its factorization.

1572161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7662.

The product of its digits is 420, while the sum is 23.

The square root of 1572161 is about 1253.8584449610. The cubic root of 1572161 is about 116.2783890276.

The spelling of 1572161 in words is "one million, five hundred seventy-two thousand, one hundred sixty-one".